This is such an important point! I think that often designers, SMEs, coders...everyone involved in the design team can become so enthralled with and focused on their design, that they lose sight of the learner experience. It seems to me that true LXD requires that the design team set their egos aside and be flexible and open to change in order to provide the best and most effective learning experience for the learner. If the design itself induces frustration, the learner may give up and never get to the actual learning process. Designers need to strive for ease of use and provide design with limited barriers for the learner
I have seen the role of designer-ego play out in the real world. In my role as a virtual math teacher, my colleagues and I regularly reached out to the curriculum team to request a change to the virtual book, activities, or assessments in order to enhance our students' experiences. Too often, we were told no, with no regard for the learner.
My frustration with this led me to want to move into curriculum so that the learner's point of view would be better understood and represented. That is part of what led me to my current role in Gifted and to the ID program at UF.